X = int(input())

if 30 <= X:
    print('Yes')
else:
    print('No') X = int(input()) X int(input()) int input() input if 30 <= X:
    print('Yes')
else:
    print('No') 30 <= X 30 X print('Yes') print 'Yes' print('No') print 'No' X = int(input()) int(input()) X
X = int(input())

if 30 <= X:
    print('Yes')
else:
    print('No')